History of Atom timeline

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  • Aristotle's Discorery
    332

    Aristotle's Discorery

    (Approximate Date). Aristotle stated that all things are made of matter. He also said that everything is composed of the five elements in which he believed existed: fire, water, earth, air, and aether.
  • Period: 332 to

    Atomic Theory

  • John Dalton's Discovery

    John Dalton's Discovery

    (Approximate Date). He created a theory that stated: All elements are created from atoms but differ from other elements atoms. He also introduced compounds. The final part of his theory stated that when elemets are joined, seperated, or rearranged a chemical reaction occurs.
  • J.J. Thompson's Discovery

    J.J. Thompson's Discovery

    (Approximate Date). He invented the Cathode Ray.
  • Max Planck's Discovery

    Max Planck's Discovery

    (Approximate Date). He created a theory that he called Planck's Postulate that described the stability of electrons and other subatomic particles.
  • Earnest Rutherford's Discovery

    Earnest Rutherford's Discovery

    (Approximate Date). He noticed one day while conducting an experiment that the alpha beams didn't go straight though the foil, instead they deflected in diffrent directions.
  • Niehls Bohr's Discovery

    Niehls Bohr's Discovery

    (Approximate Date). Using Planck's Quantum Theory he concluded that electrons circle around the nucleus of an atom.
  • J.J. Thompson's 2nd Discovery

    J.J. Thompson's 2nd Discovery

    He dicovered isotopes by sending ionized Neon through an electric field
  • Erwin Schrodinger's Discovery

    Erwin Schrodinger's Discovery

    (Approximate Date). He came up with the quantum mechanical atomic model wich showed the constant motion of the ring around the nucleus.
  • Democritus' Discovery

    Democritus' Discovery

    (Approximate date). He created the Atomic Theory which stated thatall things are made up of atoms.